[rules-users] Drools fusion and absence of events

[Edson Tirelli]

    Richard,

    It depends on which mode you are running the engine (STREAM or CLOUD)
and in case you are using STREAM, which clock are you using.

    If you are using CLOUD, Drools assumes all facts/events are available,
and does not wait to fire the activation.

    If you are using STREAM mode, then Drools will delay the firing of the
rule with a temporal negative pattern for the necessary time (10s in your
case) and if after that time the rule is still active, it will fire it. The
type of session clock you use, obviously influences the flow of time, where
the 10s might be real time, or pseudo time controlled by the application.

    The way the rule is written is consistent with the intent you described
in your e-mail, so my guess is that you might be using different
configurations as described above.

    []s
    Edson

2009/10/28 Richard Ambridge <Richard.Ambridge at sun.com>

> Hi,
>  Trying to get to grips with Fusion and absence of events...
>
>  If I have a Bean that has just a simple variable,  e.g.   class
> MyBean {   private String name;   getter+setter }
>
>  I want to use events to determine when an object with  name=="one"
> is available, and no object with name=="two" appears within 10 seconds..
>
>  So, I write a rule:
>
>  declare MyBean
>   @role( event)
> end
>
> rule "myrule'
>   when
>       $a : MyBean(name=="one");
>       not( MyBean(name=="two", this after [0s,10s] $a))
>   then
>       //do something
> end
>
>
> If I inject  an object with Name="one",  and then wait 10seconds, I
> get the 'myrule' fired,  great!
>
> But, if i inject an object with name="one" and then 1second later I
> inject an object with name="other"
> the 'myrule' is fired..
>
> Looking at the manual, this seems kind of correct,  the rule says  if
> I have a "one" and not a bean with name=="two"
> which I do,  as I have a 'one' and a 'other'
>
> But, how do I write the rule to say,  I have a 'one' and 'two' doesn't
> turn up?
>
> Cheers
> Ric
>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com
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